SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f85b515b714f7dbf43750a7d63d615ee954f7edd8a6de77ca31d8a05058dea66' 
  AND token = 'a5BAF/FOLow8zpW/yJGvLMRP9dgZ9CoHnFb1ShBRKyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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