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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c009e48e2431e7ed22536fbe3b046497c35403f78aeb2e2f32e724bc797285e9' 
  AND token = 'r+n0bDg06fUD4UtY4EyJU6KCdSYYA4rBPtnMY/5hTcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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