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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6787f1c2d55762d1f1deef0a3cafaf4fa9130ecebe73c42ae582034e00fca5ba' 
  AND token = 'cTdEqnum8PN/Hu5Ec3Gb2bZKt7InRNiAF/DFKPrGNO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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