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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11885c0bf3184df2e8cbd3aa91b3fa6ed8c9d9723cad80163b8a92b03c3d1d6d' 
  AND token = 'dq+mCs/MC31lYqAKxUCefrtbmVqXuHe3aJAUtREjnrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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