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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6db9edafa7082e123d6e9aaf836fb944c79a4d8094282a703f73e4a39e1b5469' 
  AND token = 'VZ+i94I7B170XFcPoUCk6bMI/3UmvvWN7D8QPkm7GyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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