SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bab347ed1095cdc9ff0a185a5962de219180dca841c9f36b963471716171545' 
  AND token = 'sujxTdyVxkDplyx++uFWgBgcI+jGOJoXEmhBCiShfFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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