SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d673f6980aeec845b03f1f4fa6ad723e4da9e6622a6602999a06aa4a810bc97' 
  AND token = 'DkyiqDq5YR2TBsvjZwpohqBS6PMhmzrKaaoVfTYv15M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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