SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a07ac83e1fac409db762efa3bd58529d890064c1ef1369492161397e2f233be7' 
  AND token = '10LhEQUJzuSsLq+PDGxHE2jVLNHhyPh1srsHIkC1hvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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