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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '268c80f761ecdb8bf6ac3d318157df830a3d571f786ee48bfcf7f21b3f491616' 
  AND token = 'R36OSN4ELCOMPYprCjBaqAVblz78vrduiSYQaV+nsgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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