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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c021e36c81c72dd7ab53e30b21bd4948a3d285b6362923ae5d74f688eccb8a79' 
  AND token = 'Tz5LCcvj+xnuGBISIusu6jMLsEQVM2aykGOnTIbX9hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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