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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54248b9da1974c0c92f0ad7b16790e90bb90b5b949c3adb7fb7dd5593ab48153' 
  AND token = 'Rl1ktRuTuvTD1jfj00vJZm5iEiMQr7AsGC/SRA5GP9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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