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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '505dfa7fdea49262e82f07de6639b7e1dfbf8fc5460711a79cf0f9396552f161' 
  AND token = '0XG3CX9TudxvNuGp5bzqoNoIJ1wx/RglxbPx5Kzda90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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