SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd65f6b4955badd3087fed2bfd2d0e6a99c8748fdf0256f0aa07e8a4127901220' 
  AND token = 'XzcaCMRHxZnlqqJDDd3wXBMfVrGdG3M6G8jz/IXj+CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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