SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f47a6c2ecb12b0894c3415c481fad51c0914e5f2135b80918c6ce5b5a3b7a6ea' 
  AND token = 'gTIuEzVl0dJ38B2k6nwV14hD73ndoLZqHaWgHbXAmyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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