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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a103ef1b48538bcf5d6c4bca4407030bc175fed2d8b1728279741e2abbc96cb6' 
  AND token = 'NC2KpEPq0I4BlMbKHeQFz7KdQbG/s9SLAs3dqAu/KYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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