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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfb4ec636340b2928ae9e1054f3fb8020c264b8b9c154443f624c868f2035adf' 
  AND token = 'Jlu0NrK2idA08d4MVWTItTv/MuXVF0Dl6MaK66ZCKjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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