SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58e3a969d3d11a6566b71cbcca95506b53d4f2de5f7f62a60740f6435f968d09' 
  AND token = 'QgwaFpFYbuBVGE8QFv400/7lrLGAv8rEDkKH5L+/Q80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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