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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1fbe7c21c768cceb40d1bcf03ca4d818e0bece961c975ac9f86a9a1a05b87be' 
  AND token = 'byWUvzmbbL6wMrEInOHgv1JjkSXkt8MOyosBBgKmYUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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