SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c05a865bf8f892e09d06772844cb2376ad3bed7b7fb44037bfabfbf86563bb8f' 
  AND token = 'FLcyjoKzCtzR3vQ/vfGyDwfWyg9LP54Qv4v2sY9BnAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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