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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47e2ff8310476614709865027cd14f53e9d82becd96589ea5f4ec145f46a90e5' 
  AND token = 'mcCQdkf/jLcwT8eaDda/H0jhmhRW7ZwBbfbmU8n5wbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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