Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ec3729d7f6f5b06f9404fae00da3e1af01bb74d7baca06fe9b7a26ef1efd77' 
  AND token = 'b8Izi8yMfdLj/Hy1VCU45fVyUEtQqWeLBqbkLiBq9YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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