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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28c122d8530245969d9ecaa9564e9328d687ad4ec0e76724d23f7f89603dd9d7' 
  AND token = 'SJhwxAVhltIifjTA9IgOOXV+Pn2nV5DalPF7lj3ml1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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