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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1f69750b89eeccf509ef623b9fc5994bab3d6c29691f28760e334d304bea899' 
  AND token = '7NrHvQx7ZNPgnlwCMyRcTqj5SAZ5OiUu9fkyUgvk5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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