SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1bd8faa8cf072f87f5ddc3c139176eac44a46e441c3e723256168b564d060ab' 
  AND token = 'vegNi17n/a6+wSybvUu/GuzZ/SMOj1jiQlDvBLU0Z/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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