SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe573cfad6b4f3733db3d4bb1c677465b85f8bef37b403bbf80d7847beae203' 
  AND token = 'tMYcFJ2MEXWCZJ6dk/92AwABqB+yVnBYY8X2QB8QzjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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