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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0c7c51ca11088ca721c525d4b2f8617b8f353c31e11998fc6788bc55c8746e9' 
  AND token = 'HeEOG91kKj8vFc6hTKUvoRtKpBbM/vcwmp9pEPa9BRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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