SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26495062da70d6d456f7cbd2ad9a31f9225e5c3b768b8c082ca5d787c6a813d8' 
  AND token = 'sJpq3TrAHIQdMqzPNNgQZjdGUkGejEuSf4yvZnryvYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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