SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86cef9c8fbac1b4795ef21060af5275a45c6de8d3df644994e4d3cf62ce7a144' 
  AND token = 'cgzLeIjF2isVx8hWpozAIEs0ZKnG8vkGsHmqi+X5YO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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