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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb0ec38d6b84326c55a6e01e610e24e0f7e455c1508af24d53e5d0d187934218' 
  AND token = 'X9L+tS8Yv+UxvjYzHsxUX0YXpJ9VHRxFLA4qSYktOlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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