SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3319c7675b8106cede83befa05490b185cc748635d104acd7def1c07826f4c' 
  AND token = 'f2ZQ8HE89/CY/MYFQyz7aTw+y2jKVum/WKVl4rCDqvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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