SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef3a4abb0f65fe7f2101421fed8b237ec6ed975e56fdb6fdd328723de292ea4a' 
  AND token = 'B/8ipThR9EdBLJCGVwqD6AOs0wZ8JyGxA1tR+nDmM2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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