SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a24f3ffdf93b7321f7434209ebfcf9b560a65688d03a262a474c764f99557cf2' 
  AND token = 'FzONpBEPoaCHv8tKeje5ZTerj4J/sxYVK1mN/CFlzsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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