SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02974b0fda91247b2fb63a9c7ec835066e83e9a50443c8ebb2314ceb5688d32a' 
  AND token = '/KGVJ7j5N5BCB0G2PCFynsrCT23JZQ6IX49q/I/OQaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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