SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '337029ff489fe888d92a27a50961eaa30b685d16f94db8d042148d9958c8e8d1' 
  AND token = 'dvHN+VAL9AhPAyeXWFLW/Fqw2r1K+BAbyqaTMNV5GV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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