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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'beca239c7cbb13bbbb180b2e21dae2cd6710e1beff9e00fce1513e890a5a3375' 
  AND token = 'GVnS2S5HR4LT0ddFMsERpiDs8WIo8RHzkbwGn7urzP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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