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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac588f370948e7f524fc0dd62a8f11bb0f168fa04e2a0dc8be3335a1c0cc1d8' 
  AND token = 'R7w6pcDvUGtZTlRxSvLwSE7he5s43wdVxcOArn8ABZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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