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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48dec9927de99a480327f1af5ef210da61198c8db85b1869443e2ae0df217d01' 
  AND token = 'VWNpXkRvpBOEBc1dzW0eqt8nArMOkj6k0vM1bVMoeNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}