SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb4f05f6bca3d29ad5b80daf234566e37c52ae3a6f851ce9426fdaabca9bb1d6' 
  AND token = 'vWITjJBygu66XDYZN5lru6NExyQuCRGYXAtzrhvgXp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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