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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e0685205a949de251fbe3c03a9881995873075fdaf73d2ea8197b3905728a70' 
  AND token = 'hHBVsSi8miELD6Os0yiLwfn5Ja2K1gmfL3L2UPjpXfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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