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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cc2dcc0054bdbc7dd5de88c782b6ff33f4a7646c083ea63c8ad2620fd7f4b0e' 
  AND token = 'n9+UD/T9oHiViYC0bFmbVl05FY6BhVVxjcM3mAj6yv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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