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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0ae4ce63f210eb9dfad5a7e504a2d5efefef6f8a73a56855e41dfec452c0686' 
  AND token = 'RmsaQB7yQgd4/uMuAN05zS49ex30KnE/Yh33MAvX7cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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