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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91dbc4a5cf4fbf8a92724fc3b6d857bcd4973bf159390f947ac9f1ce9ac5f59e' 
  AND token = 'qR/XlRxTHOOcN6a8Qc23P5aMEDFNA/H03EzZUHCsWVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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