SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37380c3a5a70491aa0e850101418c086281512dbe438b9d437a8f77c6ff3896e' 
  AND token = 'rYp4Mt86+0auOKSvJZgDRTUi2cfNnBreP0F/NL1GozU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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