SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ff5d9ed91481fbbce5e97c09c68aa2f5a3d9a4439c95a2d63736404a864801d' 
  AND token = 'ChOU7z8KOb6vrmyQlJldzVv/lj1bQrzJolObu+IpIYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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