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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89614dc80b4235267d313bef069847581b9c19505136c3df7de034c5c12bf7ee' 
  AND token = 'k326+ItMPrqh4s79T3W9kcM7isJsfCfYKn5JMvWa+LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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