SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8a6ffa3a3ab4f28758f9c4d596e6a0f62e8403383261265094d00986f74de2a' 
  AND token = 'wmqU9SZd4gWNeYkKntX/LdFKH01MTMSl1GSGcnKZJDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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