SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03de2c81626144f14ba9b96845adb555b4e7efdf651b9876d9852c62d826e904' 
  AND token = 'GYGBqCZzRowL8Y6WuBTneqbsBMM9jH7sRNmhkQ0cE9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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