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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39a8b3f33b7f664ce19c912245a5392a5522e98d4d7932c7dc85f1eed3a37a7a' 
  AND token = 'YYaNjtBObFg+XquS+nm4LYNF1EQMDyIrH36lSKjlWuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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