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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6779f19f7d2eec1ddbd4ec0ed4e1af0c2f8a612463561b05bb5a1fcaf3816038' 
  AND token = 'xOtWALza4RWAQETJttZzBkh1Cewnn0lSGVFtPyI+zCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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