SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f165e94b9c0cd99fd4bfa716040cd805fbabc40c733e4c2e1700fcb1cb81354' 
  AND token = 'BxZGj//PYP/Jku9YVY8XkW4+acTBlPTbSUJeynbBviQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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