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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8ca952d160a5d2c60dfbea2f8d8e496af9c71ab80365c6979417a14dfb861cd' 
  AND token = 'xxkwZXFBLnVT/b0PZeBYr8svkhNbOAFtAF/NNIToaSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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