SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7a3065f0da6cfbdd197f115166293d17a9bc715ac2485473a1959706cb7a7b4' 
  AND token = '1zAovBvoux8i2v7VSnCNTR8+QIVqGx5mwJrZawk4WJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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