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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '626f769910b6c35806eec0ac41ed5be10f5facbea5166ecd3ac5163d14d6aecf' 
  AND token = '52djTjEY7W9Bzn8Q0Z79ILmMNzRLcebO5kNyOfIZnA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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