SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2efbb9bfbfbe573963167b4e8a06242b8660b1aaf5d1f4450fc6f3557783c08f' 
  AND token = '418fv4fRhlwo2WSzj9r0GZRz0flzKDl/HJJhEaq24yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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