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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9378b31f466812f10df360960e2e14ecb530b43f6ff797841a9c4ef82eef69e' 
  AND token = 'NWbsC/sNnzPYNNGIDbAfXs971O04Hbh3mrvKDa+i7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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