SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c019254131e5ce57516971c376f3511fae4c51739a655db2958fe981d2bda4bd' 
  AND token = 'Sa/7DhzCfGYLfXE9L1/lrqyCtd8dzJJXjWhVYGinuDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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