SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fb38a1df180c3c1d6769f42a954db9a71764f84fa74a99b62e70881b93f1697' 
  AND token = '9ehZxtw2MXnMOZlNLWoGpOp1dKO/BT0JYgcGDU7nqWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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