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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81cc24acda6fdfb2533e7264b09f278ad47d5ca2c5ef1fc72cfb743eaa16d74f' 
  AND token = 'xnCMhRb4xyQ3MZJDMagfUL7JpJUdTR0ZRyf0K1EL4b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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